Musa Bay, Iran
Before draining into the Persian Gulf, several rivers and streams in southern Iran converge into Musa Bay, a shallow estuary with a long history as a port. As far back as 326 B.C.E., the Greek navigator Nearchos noted that the area was already a shipping center. Today, it supports Bandar Imam Khomeini, Iran's busiest port city.
When the Advanced Land Imager on NASA's EO-1 satellite passed over on 20 January 2015, it captured this striking view of Musa Bay. Notice the dendritic pattern of the waterways. This branching shape, one of the most common patterns formed by watersheds, develops when streams move across relatively flat and uniform rock or over rock that resists erosion. Steeper terrain or terrain with faults or other structural weaknesses form other types of drainage patterns.
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Credit: NASA Earth Observatory